Bis(aminoalkyl)cyclopropenylidene\n(BAC)-Catalyzed\nIntramolecular Annulation of 2‑(2-Formylaryl)-aryl-Substituted <i>p</i>‑Quinone Methides to 9‑Phenanthrol Derivatives

This article describes a bis(aminoalkyl)cyclopropenylidene\n(BAC)-catalyzed\nintramolecular annulation of strategically designed 2-(2-formylaryl)-phenyl-substituted <i>p</i>-quinone methides (<i>p-</i>QMs) to access 9-phenanthrol\nderivatives and related carbocycles. In addition, the synthetic utility\nof this methodology has been demonstrated in the synthesis of the\nseven-membered carbocyclic core of resveratrol-based natural products\n(±)-shoreaphenol and (±)-malibatol A.